Showing 1-30 of 439 results for "

54041-U

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E Biondi et al.
Talanta, 129, 422-430 (2014-08-17)
A commercial electronic nose (e-nose) equipped with a metal oxide sensor array was trained to recognize volatile compounds emitted by potatoes experimentally infected with Ralstonia solanacearum or Clavibacter michiganensis subsp. sepedonicus, which are bacterial agents of potato brown and ring...
R T Marsili
Journal of agricultural and food chemistry, 47(2), 648-654 (1999-11-24)
A new technique using solid-phase microextraction, mass spectrometry, and multivariate analysis (SPME-MS-MVA) was developed for the study of off-flavors in milk. The analytical column of a GC/MS system was replaced with a 1-m deactivated fused-silica column, which served as a...
M N Kayali-Sayadi et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 796(1), 55-62 (2003-10-14)
Given the key role of pheromones in animal communication and behaviour, there is need to identify the different classes of these molecules under varying physiological conditions. However, the highly volatile nature of pheromones and the fact that they occur at...
Virginie Larroque et al.
Journal of environmental monitoring : JEM, 8(1), 106-111 (2006-01-06)
Solid-phase microextraction (SPME) was studied for the measurement of volatile organic compounds (VOCs) in indoor air. An adsorptive PDMS/Carboxen fibre was used and an analytical methodology was developed in order to overcome competitive adsorption. Kinetics and adsorption isotherms were investigated...
Jingke Liu et al.
Se pu = Chinese journal of chromatography, 35(11), 1184-1191 (2018-01-27)
To comprehensively understand flavor compounds and aroma characteristics of foxtail millet wine, extraction conditions were optimized with 85 μm polyacrylate (PA), 100 μm polydimethylsiloxane (PDMS), 75 μm carboxen (CAR)/PDMS and 50/30 μm divinylbenzene (DVB)/CAR/PDMS fibers. The flavor compounds in foxtail...
Brett J Savary et al.
Journal of chromatography. A, 1017(1-2), 151-159 (2003-10-31)
A simple, fast, and direct procedure was developed for the simultaneous determination of the methanol and acetic acid present as esters in the plant cell wall polysaccharide pectin. After base-hydrolysis of esters and acidification of pectin samples, headspace solid-phase microextraction...
Sung-Tong Chin et al.
Journal of chromatography. A, 1255, 221-227 (2012-04-24)
Solid phase microextraction (SPME) coupled to gas chromatography-olfactometry (GC-O) is now commonly used for determination of aroma-active compounds, but the method sensitivity and selectivity is restricted by the small volume and limited type of fibre coating phases. In an attempt...
James R Hopkins et al.
Journal of environmental monitoring : JEM, 5(1), 8-13 (2003-03-07)
A method has been developed for concurrent analysis of C2-C7 hydrocarbons and C2-C5 oxygenated volatile organic compounds (o-VOCs) including alcohols, aldehydes, ketones and ethers. A multi-bed, Peltier-cooled adsorbent trap, consisting of Carboxen 1000 and Carbopack B, was used to acquire...
Carla Da Porto et al.
Planta medica, 74(2), 182-187 (2008-02-06)
Headspace solid-phase microextraction (HS-SPME) coupled to gas chromatography and mass spectrometry using the divinyl/carboxen/polydimethylsiloxane (DVB-CAR-PDMS) fibre was applied for the analysis of aroma profiles of Lavandula angustifolia L. flowers and the corresponding essential oils. The optimal sampling time was determined...
Alireza Ghiasvand et al.
Biomedical chromatography : BMC, 31(12) (2017-06-16)
The surface of a stainless steel fiber was made larger, porous and cohesive by platinizing for tight attachment of its coating. Then it was coated by a polyaniline/polypyrrole/graphene oxide (PANI/PP/GO) nanocomposite film using electrochemical polymerization. The prepared PANI/PP/GO fiber was...
Otero R Rial et al.
Journal of chromatography. A, 942(1-2), 41-52 (2002-02-02)
A solid-phase microextraction (SPME) followed by a gas chromatographic-mass spectrometric (GC-MS) determination has been developed and validated for the determination of cyprodinil and fludioxonil in white wine samples. Extraction parameters such as the selection of SPME coating, the effect of...
M Adam et al.
Journal of chromatography. A, 1084(1-2), 2-6 (2005-08-24)
A headspace solid-phase microextraction (HS-SPME) procedure based on three commercialised fibers (100 microm polydimethylsiloxane, 65 microm polydimethylsiloxane-divinylbenzene and 50/30 microm divinylbenzene-Carboxen-polydimethylsiloxane) is presented for the determination of a selected essential oils in dried leaves of yacon (Smallanthus sonchifolius). The extraction...
P G Hill et al.
Journal of chromatography. A, 872(1-2), 203-213 (2000-04-05)
A simple and sensitive method for the analysis of volatile and semi-volatile sulphur compounds in beer at trace levels was developed using headspace solid-phase microextraction (SPME) and gas chromatography with pulsed flame photometric detection. Different SPME fibres were tested and...
Shuang Chen et al.
Journal of food science, 82(12), 2816-2822 (2017-11-14)
This study investigated the aroma contribution of volatile sulfur compounds (VSCs) in Moutai liquors. The VSCs were analyzed using headspace solid-phase microextraction-gas chromatography-pulsed flame photometric detection (HS-SPME-GC-PFPD). The influences of SPME fibers, ethanol content in the sample, pre-incubation time, and...
O Pinho et al.
Journal of chromatography. A, 1011(1-2), 1-9 (2003-10-02)
Solid-phase microextraction coupled to gas chromatography-mass spectrometry (GC-MS) was applied to study the volatile compounds in "Terrincho" ewe cheese. Six types of fibers were tested and the main extraction parameters were studied. Carboxen-polydimethylsiloxane fiber 75 microm (CAR-PDMS) achieved the most...
M van Aardt et al.
Journal of agricultural and food chemistry, 49(3), 1377-1381 (2001-04-21)
The detection threshold of acetaldehyde was determined on whole, lowfat, and nonfat milks, chocolate-flavored milk, and spring water. Knowledge of the acetaldehyde threshold is important because acetaldehyde forms in milk during storage as a result of light oxidation. It is...
Wojciech Filipiak et al.
Journal of breath research, 6(2), 027107-027107 (2012-05-25)
The approach for breath-VOCs' collection and preconcentration by applying needle traps was developed and optimized. The alveolar air was collected from only a few exhalations under visual control of expired CO(2) into a large gas-tight glass syringe and then warmed up...
Ying Gong et al.
Analytical chemistry, 80(19), 7275-7282 (2008-09-04)
A simple, cost-effective analysis combining solventless extraction, thermal desorption, and determination of volatile organic compounds (VOCs) was developed and validated. A needle trap device (NTD) packed with the sorbent Carboxen1000 was used as a time-weighted average (TWA) diffusive sampler to...
H Seno et al.
Medicine, science, and the law, 39(4), 332-336 (1999-12-03)
Chloroform and methylene chloride were extracted from human whole blood and urine by headspace solid phase microextraction (SPME) using a Carboxen/polydimethylsiloxane (Carboxen/PDMS) fibre before capillary gas chromatography (GC)/flame ionization detection (FID). Whole blood or urine was placed in a vial...
Jacobo Iglesias et al.
Journal of chromatography. A, 1163(1-2), 277-287 (2007-07-14)
Headspace solid-phase microextraction (HS-SPME) is proposed for isolating and determining the headspace volatiles formed during oxidation of fish-oil-in-water emulsions. Three different fiber coatings were tested and compared for sensitivity and reproducibility. A carboxen/polydimethylsiloxane (CAR-PDMS) fiber coating was found to be...
Shih-Wei Tsai et al.
Journal of chromatography. A, 991(1), 1-11 (2003-04-22)
The solid-phase microextraction (SPME) device was used as a time-weighted average (TWA) sampler for ethylene oxide. Carboxen/polydimethylsiloxane (CAR/PDMS) fiber was used and hydrogen bromide (HBr) was loaded onto the fiber. The SPME fiber assembly was then inserted into PTFE tubing...
Gianna Allegrone et al.
Journal of agricultural and food chemistry, 54(5), 1844-1848 (2006-03-02)
Fresh juices of four Italian cultivars of lemons (Citrus limon Burm) have been analyzed by headspace solid phase microextraction coupled to gas chromatography and gas chromatography-mass spectrometry (GC-MS). The best results have been obtained with the 2 cm 50/30 microm...
J Larreta et al.
Analytical and bioanalytical chemistry, 389(5), 1603-1609 (2007-09-06)
The on-fibre derivatisation of volatile fatty acids (VFAs) using N-(tert-butyldimethylsilyl)-N-methyltrifluoroacetamide (MTBSTFA) was optimised in the simultaneous determination of VFAs together with phenols and indoles by headspace solid-phase microextraction (SPME)-gas chromatography-mass spectrometry. Firstly, the nature of the SPME fibre was optimised...
Alfredo Díaz et al.
Analytical and bioanalytical chemistry, 386(2), 293-298 (2006-08-10)
The simultaneous determination of several odorous trichlorobromophenols in water has been carried out by an in-sample derivatization headspace solid-phase microextraction method (HS-SPME). The analytical procedure involved their derivatization to methyl ethers with dimethyl sulfate/NaOH and further HS-SPME and gas chromatography-mass...
Elżbieta Dobrzyńska et al.
Journal of separation science, 36(20), 3372-3378 (2013-08-21)
A needle-trap device, with immobilized sorbent inside the syringe, coupled with GC-MS was applied for air sampling and determination of chlorinated volatile organic compounds such as dichloromethane, trichloromethane, and tetrachloromethane. The application of a needle trap packed with combination of...
Delphine Bourdin et al.
Analytical and bioanalytical chemistry, 406(1), 317-328 (2013-11-21)
Solid-phase microextraction on-fiber derivatization applied to carbonyl compounds is known, but application to indoor air is poorly developed and the methods deserve to be complemented and optimized. In this work, two derivatization reagents, pentafluorophenylhydrazine and o-2,3,4,5,6-(pentaflurobenzyl)hydroxylamine (PFBHA), and three fiber...
J S Elmore et al.
Journal of chromatography. A, 905(1-2), 233-240 (2001-02-24)
The volatile aroma compounds in cooked pork were examined using solid-phase microextraction (SPME). Two SPME fibres coated with different stationary phases were used simultaneously to collect aroma compounds from the headspace above the pork. One fibre was coated with 75...
Ai-Nong Yu et al.
Food chemistry, 110(1), 233-238 (2008-09-01)
The volatile compounds of Chinese traditional smoke-cured bacon (CSCB) were studied using SPMS-GC/MS. There were 48 volatile compounds identified and quantified, which belonged to several classes of chemical: 1 alkane, 16 aldehydes, 5 ketones, 9 alcohols, 4 thioethers and thiols...
Bocchini et al.
Rapid communications in mass spectrometry : RCM, 13(21), 2133-2139 (1999-10-19)
In this work, a solid-phase microextraction (SPME) method for the extraction of volatile organic compounds (VOCs) from water samples has been developed. Fifty-five volatile compounds (from the sixty listed in EPA method no. 524.2) were extracted from aqueous solutions using...
C C Camarasu
Journal of pharmaceutical and biomedical analysis, 23(1), 197-210 (2000-07-18)
A solid-phase microextraction (SPME) method has been developed and optimized for the polar residual solvent determination in pharmaceutical products. Five different polymer-coated fibers were investigated and the Carboxen/polydimethylsiloxane was found to be the most sensitive for all components. Two Headspace...